<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>



<body>
  <div id="app"></div>
  <!-- 1.引入依赖 -->
  <script src="../react/react.development.js"></script>
  <script src="../react/react-dom.development.js"></script>
  <script src="../react/babel.min.js"></script>
  <!-- 2.开始开发 -->
  <script type="text/babel">
  
    class App extends React.Component{
      constructor() {
        super()
        
        this.state = {
  
        }
      }

      render() {
        return (
          <div>
            {/* JSX中的注释 */}
            <h2>hello world</h2>
          </div>
        )
      }
    }
    ReactDOM.render(<App/>, document.getElementById('app'))
  </script>
</body>

</html>